Method of making boiler baffles



1,563,968 G. H. DICKSON I METHOD OF MAKING BOILER BAFFLES Original Filed June 4. 1918 INVENTOR.

V KZQ -42 ATTORNEYS.

Patented Dec. 1, 1925.

UNITED teases ore-ice.

GEORGE I-I. DICKSON, OF CHICAGO, ILLINOIS, ASSIGNOR TU THE BABCOCK & WILCOX COMPANY, OF BAYONNE, NEW JEREiEY, A CORPORATION OF NEW JERSEY.

METHOD OF MAKING BOILER BAFFLES.

Original application filed June 4, 1918, Serial No. 238,097. Divided and this application filed December To (all whom it may concern:

Be it known that I, GEORGE H. DIoKsoN, a citizen of the United States, residing at Chicago, in the county of Cook, State of Illinois, have invented certain new and useful Improvements in Methods of Making Boiler Battles, of which the following is a specification.

My invention relates to the construction of baflies used in boilers, and will be understoodby reference to the accompanying drawings illustrating an apparatus for carrying out my inventionand in which, Figure 1 is a side View of a portion of two banks of tubes of a water tube boiler with the baffle in section and with spacing strips in place before pouring the plastic material; Fig. 2 is a view similar to Fig. 1 with the spacing strips removed and the baffle ready for pouring; Fig. 3 is a similar view of the battle as completed after pouring, and Fig. & is a vertical section on the plane of the line 4Ll of Fig. 1.

Similar reference numerals indicate similar parts in the several views.

My present application is a division of my prior application, Serial Number 288,- 097, which was filed in the United States Patent Otlice on or about June at, 1918.

Referring to the drawings, the numeral 1 designates a portion of the tubes of a water tube boiler, the tubes being arranged in two groups or banks. It has been customary to build the baflies ofthis type of boiler of walls of tiling and cast-iron flame plates resting upon the tubes. A bafie built in accordance with my invention retains this general character of baming, but I have separated the walls of tiling and interposed between them a wall of poured plastic material and also, where desired or necessary, a wall of plastic material between the flame plate and one of the walls of tiling. The tubes are shown as divided into two banks with an interposed wall of fire brick 2 resting upon the upper row of tubes of the lower bank. The lower part of the baflle. as shown, rises from the bridge wall 3. In the practice of my invention I proceed as follows I build up the two walls l and 5 of the usual tile blocks fitted around and supported upon the boiler tubes with spacing strips 6 between them and with the tiling Serial No. 607,919. Renewed Gctcber 21, 1925.

braced by wood cross pieces 7 held in place by blocks 8 forced between them and the tubes. Thebaffle made in accordance with my invention may also comprise a flame plate 9 made up, as usual, of inner and outer cast-iron plates with asbestos plates between them, spacing strips 6 being placed between the lower flame plate and the inner lower wall 5. A permanent retaining cross piece 10 comes between the upper and lower sections of the flame plates and holds the ends of the pieces which make up the flame plates, in alignment. The upper flame plate is held at its upper end by corrugated backing bars 12, which bars are in turn held by tube clamps 1.3. The lower flame plate 9 is held at its lower end by the Z-bar 11. In the arrangement shown, the upper flame plate 9 is placed against the inner wall of tiling 5, while the lower flame plate is spaced apart from the lower wall of tiling 5. The upper walls of tiling 4 and 5 are spaced further apart than are the corresponding lower walls.

tvith the parts arranged and built up as shown in Fig. 1, I then remove the spacing strips 6, as shown in Fig. 2, and pour the form so prepared with any suitable grouting to fill the space between the walls 4 and 5 and that between the lower wall 5 and the lower flame plate 9, as indicated in Fig. 3. When the grouting is set, the braces 7 and 8 are removed.

The grouting which I use may be widely varied as to its composition, but preferably I use finely ground fire-brick, Portland cement and fire-clay with which I mix a considerable portion of asbestos, preferably with relatively long and large fibres. In building the mold and in putting together thetiling around the tubes of a boiler, it will be obvious that in practice, cracks of considerable size may occur between the ad jacent tiles or parts of the mold. It will also be obviousthat, because of the tortuous path which the grouting must follow in flowing from the top to the bottom of a bank of tubes, this mixture must be relatively thin and watery. But such a thin mixture will, of course, flow readily through the cracks between the tile. To overcome this difficulty, I mix in the grouting the asbestos' as described above, so that the ashestos fibres in the grouting, finding their way to these cracks, close them sufliciently to retain the solid portion of the grouting until the same is hardened. By using asbestos, the subsequent heating of the baflle will not be injured by the destruction of the fibres as might be the case if a combustible material were used instead of the asbestos.

Various modifications may be made in the battle as described, as, for example, the present method may be employed for constructing a battle, one side only of which is faced with refractory tiling; for example, in Fig. 1, the line of tiling 5 maybe omitted, and the entire space between the line of tiling land the flame plates 9 filled in with poured plastic material. Again, if desired, the flame plates 9 may be removed after theplastic material has set, and the resulting baflle will then consist of a bafile, one side of which is faced with refractory tiling, and the body of which is of material which, before it is placed in position and becomes set and hardened, is in a plastic state.

I claim 1. The method of installing a batlle across tubes which consists in building up two walls across the tubes, at least one of which is formed of tiling, spacing the walls apart by removable means while being built, removing the said means, and pouring hardening plastic material within the space between the two walls.

2. The method of installing a bafile across tubes which consists in building up two walls across the tubes, .at least one of which is formed of tiling, spacing the walls apart by removable means between the walls and extending between the tubes, removing the said means, and pouring hardening plastic material within the space between the two walls.

3. The method of installing boiler baffling which consists in building up two walls, at least one of which is of tiles, spacing the walls apart by strips while being built, and pouring plastic material into the space between the two walls.

4. The method of installing boiler baffling which consists in building up two walls, at least one of which is of tiles, spacing the walls apart by strips while being built, pouring plastic material into the space between the walls, and removing one of the walls after the plastic'material has hardened and leaving a tile wall in place.

5. The method of installing boiler baffling which consists in building -up two walls, at least one of which is of tiles, spacing the walls apart by strips while being built, removing the strips, and pouring plastic material into the space between the two walls and then removing one of the walls after the plastic material has hardened and leaving the tile wall in place.

6. The method of installing boiler ;baffling which consists in building up two walls, at least one of which is formed of relatively small tiling, with each tile less in width and height than the width and height of the bafiie, spacing the walls apart by strips, while being built, with strips suflicient in number to hold each small tile in place, and pouring plastic material into the space between the two walls.

7. The method of installing a battle across tubes which consists in building up two walls across the tubes, at least one of which is formed of tiling, spacing the walls apart by strips while being built, bracing the walls against outward displacement by pieces held in position by the tubes, removing the strips, pouring hardening plastic material into the space between the walls, and finally removing the bracing pieces.

8. The method of installing boiler baffling, which consists in building up two walls spaced apart, with each wall made up of a plurality of parts placed edge to edge and with the parts fitted to the exterior of the boiler tubes,-mixing a thin grouting of hardening plastic material with asbestos fibres and pouring such mixture between the walls, the fibres selected for the mixture being of such a size as to assist in preventing leakage of the mixture at the joints in the walls "before the mixture is hardened.

9. The method of installing a battle across tubes which consists in building up two walls across the tubes, at least one of which is formed of tiling, bracing the walls on their outer sides-against outer movement, spacing the walls apart by strips while 'being built, removing the strips, and pouring hardening plastic material within the space between the two walls.

GEORGE H. 'DIOKSON. 

